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Automated website audit & personalized outreach with Lighthouse and GPT-4

ShahrukhShahrukh
1461 views
2/3/2026
Conditional LogicWebhookData ProcessingHTTP RequestAPI Integration
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Create AI-Driven Website Audits & Personalized Outreach with Lighthouse and GPT-4

Who is this for?

This workflow is perfect for marketing agencies, SEO consultants, and growth specialists who need to scale personalized outreach without spending hours on manual research.

What problem does it solve?

Traditional cold outreach feels generic and gets ignored.
This template automates website audits and personalized email creation, making your outreach look deeply researched and relevant—at scale.

What this workflow does

  • Pulls business details from a Google Sheet (which you can fill via tools like Google Maps scrapers)
  • Finds company emails using an AI-powered scraper
  • Captures a screenshot of the business homepage
  • Runs a Lighthouse audit (Performance, SEO, Accessibility, Best Practices)
  • Performs UI analysis to spot design gaps using GPT-4
  • Generates a personalized outreach email that references real site data, tone, and scores

Result:
You end up with dozens of qualified leads, each with a full audit report and a ready-to-send outreach email.

Requirements

  • n8n account (self-hosted or cloud)
  • Google Sheets credentials (use n8n’s built-in credential manager)
  • OpenAI API key (stored securely in n8n credentials)
  • Lighthouse node installed

How to Set Up

  1. Connect Google Sheets → Use it as your lead source
  2. Add your OpenAI and Google credentials via n8n credential manager
  3. Replace placeholder variables in the “Set” nodes for your campaign
  4. Enable the Lighthouse node for audits
  5. Run the workflow manually or schedule it

How to Customize

  • Change the email prompt in the OpenAI node to match your tone
  • Modify the Google Sheet structure for different niches
  • Add extra steps (e.g., push to a CRM or email sender like Instantly)

Feel Free to drop me an email if you need help with building a custom automation for your business at : shahrukh@marketingbyprof.com

Automated Website Audit & Personalized Outreach with Lighthouse and GPT-4

This n8n workflow automates the process of auditing website performance using Google Lighthouse, generating personalized outreach messages based on the audit results with OpenAI's GPT-4, and managing the entire process through a Google Sheet.

What it does

This workflow streamlines the website auditing and outreach process through the following steps:

  1. Triggers Manually: The workflow is manually initiated, allowing for on-demand audits.
  2. Retrieves Website Data: It fetches a list of website URLs from a specified Google Sheet.
  3. Performs Lighthouse Audit: For each URL, it makes an HTTP request to a Lighthouse API (or similar service) to obtain a performance audit.
  4. Checks Audit Status: It checks if the Lighthouse audit was successful and if the performance score meets a predefined threshold (e.g., greater than 50).
  5. Generates Personalized Outreach (if score is low):
    • If the website's performance score is below the threshold, it extracts relevant audit details.
    • It then uses OpenAI's GPT-4 to generate a personalized outreach message, highlighting the identified performance issues and offering solutions.
  6. Updates Google Sheet:
    • If the audit is successful and the score is high, it updates the Google Sheet to reflect the "Audit Done - Good Score" status.
    • If the audit is successful but the score is low, it updates the Google Sheet with the "Audit Done - Low Score" status and includes the generated personalized outreach message.
    • If the audit fails, it updates the Google Sheet with an "Audit Failed" status.
  7. Delays for Rate Limiting: A Wait node is included to prevent hitting API rate limits, ensuring smooth operation, especially when processing multiple websites.

Prerequisites/Requirements

To use this workflow, you will need:

  • n8n Instance: A running n8n instance.
  • Google Sheets Account: A Google Sheets spreadsheet containing the list of website URLs to be audited.
  • Lighthouse API Endpoint: Access to a Lighthouse API (e.g., a self-hosted Lighthouse CI server, or a third-party service that provides Lighthouse reports via API). The workflow assumes an HTTP endpoint that returns Lighthouse audit data.
  • OpenAI API Key: An OpenAI API key with access to GPT-4 or a similar large language model for generating personalized outreach messages.

Setup/Usage

  1. Import the Workflow:
    • Download the provided JSON file for this workflow.
    • In your n8n instance, click "New" in the workflows section, then "Import from JSON" and upload the file.
  2. Configure Credentials:
    • Google Sheets Node (ID: 18): Configure your Google Sheets credentials. You'll need to specify the Spreadsheet ID and the Sheet Name where your website URLs are listed.
    • HTTP Request Node (ID: 19): Update the URL to your Lighthouse API endpoint. You may also need to configure any necessary authentication headers or query parameters for your Lighthouse API.
    • OpenAI Node (ID: 1250): Configure your OpenAI API key.
  3. Adjust Logic (Optional):
    • If Node (ID: 20): Modify the condition for the Lighthouse performance score if you want a different threshold for "good" vs. "low" scores.
    • Code Nodes (ID: 834): Review and adjust the JavaScript code in the "Code" nodes if you need to change how data is extracted from the Lighthouse report or how the prompt for OpenAI is constructed.
  4. Activate the Workflow: Once configured, activate the workflow.
  5. Run Manually: Since this workflow is triggered manually, you will need to click the "Execute Workflow" button to start the audit process.

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